Shuttle-actuating mechanism for sewing-machines



2 SheetsSheet 1.

(No Model.)

H. R. TRAGY.. SHUTTLE AOTUATING MECHANISM FOR SEWING MACHINES. No.471,037. Patented Mar. 15, 1892.

@llllfi witness/0o alter/mug,

35 her ai wawtoz (No Model.) 2 Sheets-Sheefi2.

H. R. TRACY. SHUTTLE AGTUATING MECHANISM FOR SEWING MACHINES.

Patented Mar. 15,1892.

witmooeo 351 11 01 attozmu areas 00., "IMO-HTML, wasuwc'rou, o 1:.

UNITED STATES PATENT Gr nch.

HARRIET RUTH TRACY, OF NEW BRIGHTON, NEW YORK SHUTTLE-ACTUATINGMECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 471,037, dated March15, 1892.

Application flled December 18, 1891' Serial No. 415,520. (No model.)

.To all whom it may concern:

Be it known that I, HARRIET RUTH TRACY, a citizen of the United States,residing atNew Brighton, in the county of Richmond and State of NewYork, have invented certain new and useful Improvements inShuttle-Actuating Mechanism for Sewing-Machines; and I do hereby declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.-

This invention relates to sewing-machines.

The object of the invention is to produce a mechanism for imparting tothe loop-taker of a sewing-machine an intermittent movement, whereby arotary motion will be imparted to the loop-taker to carry the loop ofthe needlethread when presented to the loop-taker and to stop the samewhen a loop taken by the loop-taker is being drawn up into the cloth,the cessation of movement being so timed as to allow the forwardmovement of the cloth and the operation of the feed during suchcessation.

With these objects in view the invention consists, essentially, in asewing-machine comprising a driving-shaft provided with a gearwheel, anindependent shaft mounted adjacent to the main shaft and provided with agear-wheel meshing with that on the main shaft of the machine, a secondgear-wheel loosely mounted on the independent shaft and gearing with theloop-taker of the machine, and two sliding pins, one mounted on theframe of the machine and the other carried by a wheelinterposed betweenthe gear-wheels on the independent shaft and revolving with the shaft,and calms whereby the pins are alternately brought into contact with anddrawn from the loose gear-wheel.

In the accompanying drawings, forming a part of this specification, andin which like letters of reference indicate corresponding parts, Figure1 is an end elevation of a sewing-machine containing my invention. Fig.2 is a side elevation of the shuttle and of the parts moving the samecontaining my invention. Fig. 3 is a detail view of a supporting devicefor the driving and stopping mechanism. Fig. t is a View in sideelevation of a wheel having a cam-groove, whereby the pins of thestopping mechanism are operated. Fig.

5 is a view, partly in section, showing the means for accomplishing thestopping and starting of the shuttle. Fig. 6 is a view similar to Fig. 3with the pin-operating wheel in position, with the inner pins engagedand the outer pins free; and Fig. 7 is a similar view with the outerpins engaged and the inner pins free.

In the drawings, A represents the main driving-shaft of the machine, onwhich is placed a belt or other wheel, (not shown,) which receivesmotion from any suitable source, such as a treadle, motor, or the like.Motion from the driving-shaft is communicated to the needle-bar and tothe shuttle in any suitable wellknown way to cause two reciprocations ofthe needle-bar to each complete revolution of the loop-taker.

One way of driving the loop-taker is shown in the accompanying drawings.A large gearwheel B, of suitable size and fixed upon the driving-shaftback of the loop-taker, has at each side of it and supported in hangersb on shafts b gear-wheels B of one-half the diameter of the gear-wheelB, and meshing with this wheel, while mounted loosely on the outer endsof the shafts 12 are gear-wheels B of the same diameter as theloop-taker.- Interposed between each of the gear-wheels B and agearwheel B is the mechanism whereby the gearwheels B are given motionfrom the shafts b and are stopped twice during each revolution of theshaft. This mechanism comprises a wheel 0, fixed upon the shaft b andcarrying on its inner face a rigid pin, upon which slides a plate 0carrying a pin 0 which is capable of sliding through a hole in the wheelC to project from the front face thereof or to be withdrawn to aposition bringing its ends flush with the outer face of the Wheel. Theupper portion of the plate 0 projects a short distance above the pin 0and this projection enters grooves din plates D on the hangers as thewheel 0 revolves. The grooves 01 are so formed that the pins 0 are movedinto one of the curved slots d of the gear-wheel B at the time when theneedle of the machine, through suitable intermediate mechanism, is at aposition to present the loop of the needle-thread carried thereby to oneof the hooks of the loop-taker. The pins 0 entering the slots (1 turnthe wheel B around half a revolution,

when the pins are withdrawn by grooves similar to the grooves 61 andpass through an open space between the plates D before they are againbrought into engagement with the gear-wheels B The peripheries of thewheels 0 are provided with cam-grooves c, in which rest plates 0carrying pins 0 The plates 0 are supported on the pins 0 which areplaced in such position on the hangers b as to be opposite to slots 12in the gear-wheels B The pins receive a reciprocating motion during theoperation of the machine, and the wheels C are so placed on their shaftsthat the pins 0 are projected into one of the slots b at the time whenthe pins 0 are withdrawn from the slot [1 serving to check the motion ofthe gear-wheels.

As additional means of checking the motion of the gear-wheels B, Iprovide the springseated pins 0 with their outer ends rounded, thesepins being designed to enter indentations in the inner face of thegear-wheels, placed in such position as to be opposite the pins 0 whenthe impelling-pins are withdrawn.

The loop-taker of the machine is designated by the letter E. It ispreferably made in the form illustrated in the drawings, decreasing inthickness from a point near its center toward its circumference, Wherethe thickness is so reduced as to present a small edge, and

the periphery is provided with gearteeth meshing with those of thegear-wheels 13'.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is

A sewing-machine comprising a loop-taker having peripheral engaging-gearand a driving-shaft provided with a gear-wheel, an independent shaftmounted adjacent to the main shaft and provided with a gear-wheelmeshing with that on the main shaft of the machine, a second slottedgear wheel loosely mounted on the independent shaft and gearing with the1oop-taker of the machine, and two sliding pins, one mounted on theframe of the machine and the other carried by a wheel interposed betweenthe gear-wheels on the independent shaft and revolving with the shaft,and cams whereby the pins are alternately brought into contact with anddrawn from the loose gear-wheel, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

HARRIET RUTH TRACY.

Witnesses:

R. G. DYRENFORTH, E. II. PARRY.

